中间件在OLTP中的应用

OLTP系统是计算机应用的一个重要领域。该文全面分析了基于中间件TUXEDO的OLTP系统解决方案,介绍了这一方案的各个功能 模块以及相互之间的关系,提出了基于中间件TUXEDO的、对OLTP系统业务逻辑层的组成。     

Kinetic modeling of Fe‐BEA as NH3‐SCR catalyst—effect of phosphorous

The focus of this work is to investigate whether a previously developed microkinetic deactivation model for hydrothermally treated Fe‐BEA as NH₃‐SCR catalyst can be applied to describe chemical deactivation of Fe‐BEA due to phosphorous exposure. The model describes the experiments well for Fe‐BEA before and after phosphorous exposure by decreasing the site density, representing deactivation of sites due to formation of metaphosphates blocking the active iron sites, while the kinetic parameters are kept constant. Furthermore, the results show that the activity for low‐temperature selective catalytic reduction (SCR) is very sensitive to loss of active monomeric iron species due to phosphorous poisoning compared to high‐temperature SCR. Finally, the ammonia inhibition simulations show that exposure to phosphorous may affect the internal transport of ammonia between ammonia storage sites buffering the active iron sites, which results in a lower SCR performance during transient conditions. © 2014 American Institute of Chemical Engineers AIChE J, 61: 215–223, 2015     

基于中间件的自助服务平台的设计和实现

随着电信业务量的扩大和自助服务领域的不断成熟，电信业务已经开始借助自助服务系统来实现。现有的自助服务系统一般都采用传统的客户／且匣务器模式来实现，系统基于可伸缩性、可靠性等方面的考虑较少，不利于系统的扩展。文中利用交易中间件（BEA Tuxedo）构建一种交互式的电信自助服务平台，在原有的自助服务系统的基础上增加网络视频会议功能，使自助服务平台增加了对综合电信业务办理的支持。该平台的实现对于电信运营商提高服务质量，减少投资成本，增强竞争力具有很重要的意义。     

关于BEA域技术处理的探讨

BEA Systems，Inc．是全球领先的计算机应用基础件公司，提供企业软件基础架构。其所开发的行业领先的应用服务器WLS提供了一种全新的方法采构建、集成、保护和管理服务器端的java应用。本文讨论了WLS域中的基本组成要素并对这些组成要素的运用进行了分析。     

基于CWM和TUXEDO的实时元数据交换模型研究

随着国内数据中心的广泛建设,由于数据中心的数据来源于各个异构的数据库系统以及各个不同架构的业务应用系统,面对这样复杂的数据来源,实时交换元数据的需求也变得越来越迫切。重点剖析了基于公共仓库元模型规范(Common Warehouse Metamodel,CWM)交换元数据以及用Tuxedo中间件传递元数据的机制,提出一种基于CWM的点到点的元数据实时交换模型,该模型具有更强的可扩展性、鲁棒性和标准性,论证并探讨模型的实用能力及实现,为今后的工作指明了方向。     

关于BEA域技术处理的探讨

BEASystems,Inc.是全球领先的计算机应用基础件公司,提供企业软件基础架构。其所开发的行业领先的应用服务器WLS提供了一种全新的方法来构建、集成、保护和管理服务器端的java应用。本文讨论了WLS域中的基本组成要素并对这些组成要素的运用进行了分析。     

TUXEDO中间件系统在深圳机场MIS中的应用

介绍了应用于开放系统联机事物处理的一种中间件—— TUXEDO,讨论了其主要组件和功能 ,提出了在 UNIX操作系统下基于 TUXEDO的三层客户 /服务器应用平台的设计 ,介绍了在深圳机场 MIS中的应用实例     

建立基于J2EE的气象预警系统

根据气象服务的需求，建立基于J2EE的气象预警系统体系结构，较好地满足可靠性、扩展性、可用性业务需要。文中讨论了J2EE在组件开发、数据库访问、负载平衡与多线程等多项关键技术在建立分布、动态、实际问题的应用。     

Remarkable effect of the preparation method on the state of vanadium in BEA zeolite: Lattice and extra-lattice V species

The state of vanadium in two BEA zeolites is investigated by XRD, FTIR, DR UV–vis and EPR. One of the samples, VAlBEA (1.3 wt.% of V), is prepared by conventional ion exchange and the other, VSiBEA (2.0 wt.% of V), by a two-step postsynthesis method involving dealuminated BEA zeolite. No structural changes are observed after incorporation of vanadium into AlBEA zeolite by ion-exchange method. In contrast, the impregnation of SiBEA with V(IV) (VOSO₄) precursor leads to an increase of unit cell parameters of the BEA, to the consumption of silanol groups in vacant T-sites and incorporation of V in the framework of BEA zeolite as well dispersed tetrahedral V(V) species. NO and CO used as IR probe molecules, DR UV–vis and EPR allow to establish the oxidation state of vanadium in as prepared, oxidized, activated and reduced VAlBEA and VSiBEA zeolites. The IR spectra of oxidized, activated and reduced VAlBEA samples are very similar. It suggests that V introduced by ion exchange in extra-lattice position is stabilized on all samples in similar oxidation state. CO adsorption evidence the presence of vanadium in IV oxidation state via IR bands at about 2200 and 2180 cm⁻¹ assigned to V(IV)–CO monocarbonyl and V(IV)–(CO)₂ dicarbonyl species. In contrast, the oxidation state of V in VSiBEA changes strongly in function of calcinations in oxygen, outgassing at high temperature (773 K) and reducing with hydrogen at high temperature (873 K). This shows that lattice tetrahedral V species change easily oxidation state and this property allows them to be good candidate as active site of selective redox reactions.